Many English learners and writers often get confused between “flys” and “flies.” At first glance, these two words look very similar, but only one of them is usually correct in standard English grammar. Because of this confusion, many people search online for “flys or flies” to understand which spelling they should use.
English spelling rules can sometimes be tricky, especially when words change form depending on tense or plural usage. When a word like fly changes, the spelling may also change, which is why learners are unsure whether they should write flys or flies.
Understanding the difference is important for writing clearly and correctly. In this article, you will learn the meaning of both words, the correct spelling, grammar rules, examples, common mistakes, and helpful tips to remember the difference between flys or flies.
Quick Answer
The correct spelling in most cases is “flies.”
Flies is the correct plural form of fly and also the third-person singular form of the verb to fly (e.g., She flies every week).
Flys is generally considered incorrect in modern English and is rarely used.
Meaning and Definition of Each Word
1. Flies
Definition:
“Flies” is the correct spelling when referring to:
- The plural form of the insect fly
- The third-person singular form of the verb fly
Explanation:
In English grammar, when a word ends in -y, the y often changes to “ies” when making the plural form.
Examples:
- Many flies were buzzing around the fruit.
- The bird flies high in the sky.
- She flies to London every month for work.
2. Flys
Definition:
“Flys” is generally not considered correct spelling in standard English.
Explanation:
English grammar rules say that words ending in consonant + y usually change the y to ies when forming plurals or certain verb forms.
Because of this rule, flies is correct, while flys is usually a spelling mistake.
Example (Incorrect):
- The bird flys over the lake. ❌
Correct version:
- The bird flies over the lake. ✅
Key Differences Between the Words
Here are the main differences between flys or flies:
- Flies is the correct spelling used in standard English.
- Flys is usually a spelling mistake.
- Flies can be used as both a noun (plural insect) and a verb (third-person singular).
- Flies follows the common English rule of changing y → ies.
- Flys does not follow standard grammar rules.
Comparison Table
| Word | Meaning | Usage | Example |
| Flies | Plural of fly or verb form | Correct English spelling | The bird flies over the trees. |
| Flys | Usually incorrect spelling | Not used in standard grammar | She flys to Paris. ❌ |
Examples in Sentences
Using “Flies” as a Noun (Plural)
- The kitchen was full of flies.
- Several flies landed on the fruit.
- Farmers often try to keep flies away from animals.
- These flies are attracted to sweet food.
- The window was open, so many flies came inside.
Using “Flies” as a Verb
- The eagle flies above the mountains.
- She flies to Dubai for business meetings.
- A superhero flies through the air.
- The plane flies at a high altitude.
- He flies his drone in the park.
Common Mistakes
Many learners make mistakes when choosing between flys or flies.
Here are some examples of incorrect vs correct usage.
| Incorrect | Correct |
| The bird flys away. | The bird flies away. |
| She flys to Canada every year. | She flies to Canada every year. |
| Many flys are in the room. | Many flies are in the room. |
| The airplane flys high. | The airplane flies high. |
Why this mistake happens:
People often think adding “s” makes a word plural. While this works for many words, it does not work for words ending in consonant + y.
Tips to Remember the Difference
Here are some easy tips to remember the correct spelling:
1. Remember the “Y → IES” Rule
If a word ends with consonant + y, change the y to ies.
Examples:
- Fly → Flies
- Baby → Babies
- City → Cities
2. Think of Other Similar Words
Many English words follow the same pattern:
| Singular | Plural |
| Fly | Flies |
| Party | Parties |
| Story | Stories |
| Lady | Ladies |
If you remember these examples, it becomes easier to remember flies.
3. Think of Insects
When you see the insect word flies, it reminds you that “ies” is the correct ending.
When to Use Each Word
Use “Flies” When:
- Talking about more than one fly (insect)
1 Example:
- There are many flies in the garden.
- Using the third-person singular verb form
2 Example:
- The bird flies across the river.
- Talking about airplanes, birds, or people traveling by air.
3 Example:
- She flies to New York every month.
Avoid Using “Flys”
In almost all writing situations, flys should not be used.
Instead, use flies.
Grammar Rules Behind “Flies”
The confusion between flys or flies comes from a common English spelling rule.
Rule: Words Ending in Consonant + Y
When a word ends in consonant + y, the y changes to ies in plural forms and third-person verbs.
Examples:
| Base Word | Correct Form |
| Fly | Flies |
| Try | Tries |
| Cry | Cries |
| Reply | Replies |
Rule Exception
If the word ends in vowel + y, you simply add s.
Examples:
- Play → Plays
- Stay → Stays
- Enjoy → Enjoys
But since fly ends with a consonant (l) + y, it becomes flies.
Synonyms or Related Words
Here are some words related to fly depending on how it is used.
When Referring to the Verb “Fly”
- Soar
- Glide
- Travel by air
- Hover
- Drift
Examples:
- The eagle soars above the mountains.
- The helicopter hovers in the sky.
When Referring to the Insect “Fly”
Related insects include:
- Mosquito
- Gnat
- Beetle
- Ant
- Moth
Frequently Asked Questions (FAQs)
1. Is “flys” ever correct?
In standard English, flys is usually incorrect. The correct spelling is flies.
2. What is the plural of “fly”?
The plural of fly is flies.
Example:
- Two flies were on the table.
3. Why does “fly” become “flies”?
Because English grammar changes y to ies when forming plurals or verb forms for words ending in consonant + y.
4. Is it “he flys” or “he flies”?
The correct form is:
He flies.
Example:
- He flies his kite every weekend.
5. How do you remember the correct spelling?
Remember this rule:
Consonant + Y → change Y to IES
Example:
Fly → Flies
6. Is “flies” a noun or a verb?
It can be both.
As a noun:
- The room has many flies.
As a verb:
- The airplane flies at night.
Conclusion
The confusion between flys or flies is very common, especially for English learners. However, the rule is actually simple once you understand it.
The correct spelling is flies, which is used as both the plural form of the insect fly and the third-person verb form of fly. The spelling flys is generally incorrect and should be avoided in standard English writing.
By remembering the grammar rule “consonant + y → ies,” you can easily choose the correct word. With practice and exposure to examples, using flies correctly will become natural in your writing and speaking.
